| 摘要 |
A method for measuring a color property of a pressurized flowing liquid under test in a way that mitigates the disruption of light is characterized by contacting the liquid under test is against a transparent partition that is spaced a predetermined distance from a transparent window. The partition has a predetermined index of refraction and has a thickness dimension that is less than that of the window. At least some of the radiation reflected from the liquid undergoes total internal reflection within the partition while, simultaneously, evanescent coupling of that reflected radiation into the material of the window is prevented. The prevention of evanescent coupling into the material of the window is accomplished by: i) disposing a medium having an index of refraction less than that of the partition between the window and the partition, and ii) maintaining the spacing between the window and the partition to a distance not less than three (3) times the wavelength of the interrogating radiation.
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